الفهرس 
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Abstract
The research presented in this thesis was designed to: 1)- Study the effect of water stress on different maize traits and to identify thc most associatedcharacters with yield under water stress. 2)- Test the genotypic differences among many maize genotypes in drought tolerance and to identify the best ones. 3)- Estimate the heritability under different soil moisture regimes and compare these moisture regimes as evaluation environments based on expected genetic advance from direct and indirect selection. 4)- Evaluate the role of general and specific combining ability of inbred lines in hybrid performance under water stress. In 2002 summer growing season, the six maize parental inbred lines were crossed in all possible combination including reciprocals by using a complete diallel crosses mating design to obtain 30 single crosses were evaluated through two years 2003 and 2004 growing seasons under 3 irrigation treatments in 3 separated filed trials. Irrigation treatments were normal irrigation every 14 days (No drought, ND), irrigation every 18 days (moderate drought, MD) and irrigation every 22 days (severe drought, SD). Each experiment arranged in Randomize Complete Blocks Design (RCBD) with 2 replications in the 2003 growing season, and 3 replications in the 2004 growing season. Experiments of 2003 growing, season were carried out at the Experiments Station of the Faculty of Agriculture, Mansoura University. Whereas, the experiments of 2004 growing season were conducted at El-Taweela Village, Talkha Center, El-Dakahlia Governorate.